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Hyper-H Host to Host copying via network too slow

已答覆 Hyper-H Host to Host copying via network too slow

  • Wednesday, February 13, 2013 7:02 AM
     
     
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    I have 2 hyper-v hosts bot are running server 2008 r2 with Sp1. recently we moved our application server to another host . i have export guest first

    then while copying via network its very very slow. takes neare about 7 hours to copy via network guest size is only 33 GB only.

    need help :)

    Akshay Pate

     

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  • Wednesday, February 13, 2013 1:50 PM
     
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    We need help, too. :)  what speed network connects the systems?  What settings do you have enabled on your NICs?  What else is running on the network?  Are you getting any network errors?  AAre any other applications exhibiting performance problems in this configuration?  Were there any issues in the performance accessing the VMs?

    .:|:.:|:. tim

    • Marked As Answer by Akshay Pate Saturday, February 16, 2013 8:21 AM
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  • Wednesday, February 13, 2013 1:56 PM
     
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    speed is in fluctuating655 kbps to1.5 Mbps i have bridge both NIC'S all NIC has 10Gbps there is nothing extra apps running on networks except VSS application. on host there is no other application installed. there are no issue in accessing VM's. all VM's are running okk. no slowness in VM network  

    Akshay Pate



    • Edited by Akshay Pate Thursday, February 14, 2013 5:31 AM
    • Marked As Answer by Akshay Pate Saturday, February 16, 2013 8:22 AM
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  • Wednesday, February 13, 2013 2:08 PM
     
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    If somebody came to you and said their network was slow and asked you to help, what information would you ask for?  If you ask a question in a forum with that sort of mindset, it really helps others assist you.  Yes, based on your first post, it is pretty easy to see that your transfer rate is low, which you restated in your response.  But you did not indicate what speed the network between the systems is.  Okay, the hosts have 10Gbps NICs, but if the network connection between the hosts is 100 Mbps, the 10 Gbps NIC won't make any difference.  Are you using TCP offload or TCP chimney on the NICs?  Are there other things on the network that the copy traffic would be competing with?  Have you had any previous performance problems on this network segment?  Have you ever used this network segment for this purpose in the past and produced a much higher performance?  If so, what is the difference between then and now?

    .:|:.:|:. tim

    • Marked As Answer by Akshay Pate Saturday, February 16, 2013 8:21 AM
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  • Wednesday, February 13, 2013 4:29 PM
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    Some questions to ask yourself;

    Do you have physical NICs dedicated to the Management Interface?  (if not, your throughput will suffer).

    Is your bottleneck not network, but possibly disk IO?

    Is this your only example?  Copying one VM?

    TCP Chimney should not matter, however TCP offload options can, and greatly.  If you do not have a dedicated management interface on your host, your throughput is severely cut ("allow the management OS to share" checkbox in the External virtual switch settings would be a negative in this case).

    Brian Ehlert
    http://ITProctology.blogspot.com
    Learn. Apply. Repeat.
    Disclaimer: Attempting change is of your own free will.

    • Marked As Answer by Akshay Pate Saturday, February 16, 2013 8:22 AM
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  • Thursday, February 14, 2013 5:25 AM
     
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    Yes i have  dedicated physical NIC for Management  but it still copying speed is too slow

    i have to enable TCP Chimney or keep it automatic please help.

    Akshay Pate


    • Edited by Akshay Pate Thursday, February 14, 2013 5:28 AM
    • Marked As Answer by Akshay Pate Saturday, February 16, 2013 8:21 AM
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  • Thursday, February 14, 2013 1:43 PM
     
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    We are trying to help, but you are not answering the questions asked, and we need more information.

    Is this isolated to this one copy operation?  Do you get the same slow copy when you copy other files?  What is the speed of the network between the two hosts - not the speed of the NICs?  Have you measured the available network bandwidth when the copy is not running?  Do you have other systems on the same network segment that are NOT showing a slow copy speed? Trying to find out if the network is capable of your expectations.

    Picking up on Brian's thoughts about disks ... what is the disk configuration for both systems?  Is there plenty of room on the destination disk?  Is the disk local or network-based?  If network-based, is it on the same or different network from your host management network?

    .:|:.:|:. tim

    • Marked As Answer by Akshay Pate Saturday, February 16, 2013 8:21 AM
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  • Thursday, February 14, 2013 4:19 PM
     
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    Sorry for incomplete information.

    "Is this isolated to this one copy operation" i cant understand " I am new to Hyper-V"

    no its not that slow while copying another files. both host are connected to local lan so speed is very good and there is only 20 systems who are connected to hyper-v vms bandwidth will never affect while copying data yes my network is capable to do such tasks.

    both hots are having local disks and on same network.

    Akshay Pate


    • Edited by Akshay Pate Thursday, February 14, 2013 4:20 PM
    • Marked As Answer by Akshay Pate Saturday, February 16, 2013 8:22 AM
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  • Friday, February 15, 2013 2:31 AM
     
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    Okay, if any other file copy from other machines on that network segment perform within your satisfaction range, then we can start looking more closely at the Hyper-V hosts themselves.  We were just trying to eliminate things that might cause this that are external to Hyper-V that are often the cause of the problem.

    What do you mean when you say you have bridged the NICs?

    So when you say that it is not slow when copying other files, does that mean that after you got done copying the exported files you tried copying other files between the hosts and they copy without any performance issues?  So is this a constant problem or did it just happen on the exported files?

    .:|:.:|:. tim

    • Marked As Answer by Akshay Pate Saturday, February 16, 2013 8:22 AM
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  • Saturday, February 16, 2013 8:21 AM
     
     
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    I have bridge the local lan card with virtual external lan card to

    yes when i trying to copy exported vm to another host its too slow. to check whether its relay slow i have transfer 2.9GB data from Host-1 to Host-2 and it will take only 3 to 4 minutes 

    can i enable jumbo packets on both hosts ?????

    Akshay Pate


    • Edited by Akshay Pate Saturday, February 16, 2013 8:21 AM
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  • Saturday, February 16, 2013 1:21 PM
     
     
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    Yes, jumbo frames are fine. 

    So any time that you do an export and then copy the exported files across the network between the two machines, the copy of the exported files is slow.  But if you copy any other file across the network, those files copy at a reasonable speed.  That does not make any sense at all.  The exported files are just files, the same as any other file.  The copy program has no knowledge of how the files being copied were created.

    Or, are you saying that you exported VM and specified a remote file share as the destination of the export?  Big difference in expected performance at that point.

    .:|:.:|:. tim